I have a few pages in google webmaster tools listed as double content, they don't have an seo-optimized url, just the language and item-id parameters. They all give the same result, all the blog articles.
Now, I don't have any post or page with an ID 138. Infact I can type just about any Itemid I want, it will always return the blog-articles page instead of a 404. How do I get them to return a 404 and be removed from google?